A fabric that breathes and drapes the way mulmul and georgette do will also punish you fast if you wash it wrong. Neither one is a "throw it in with everything else" fabric. Here's exactly how to treat each one, so the piece you unboxed still looks and feels the same a year from now.
Washing Roz (cotton mulmul)
Always wash in cold water. Hot water is the single biggest cause of shrinkage and fading in mulmul. Hand washing is best, and if you're using a machine, put it on a delicate cycle inside a mesh laundry bag. Use a mild detergent and go easy on it, since harsh detergent breaks down the cotton fiber over time and dulls the print. Don't wring or twist the fabric to get the water out. Press it gently between your hands instead, or fold it into a towel. (Shopmulmul care guide)
Washing Kaftans (sheer georgette)
Georgette needs a gentler hand than mulmul. Hand wash only, in cold water with a mild liquid detergent. Submerge it, swish it around for a minute or two, and rinse it twice. Don't soak it, scrub it, wring it, or put it anywhere near a machine, since the open weave distorts easily under any of that. Once it's washed, press it gently between two clean towels to pull the water out rather than wringing it. (First Resort georgette care guide)
Drying both fabrics
Shade, not sun, for both fabrics. Direct sunlight fades a printed fabric faster than almost anything else, mulmul included. Air dry mulmul indoors or somewhere shaded. For georgette, lay it flat on a clean towel instead of hanging it up wet. A wet, hanging piece of georgette will stretch and lose its shape at the shoulders and hem, which is about the fastest way to ruin how a kaftan sits. Keep it away from a fan running on full speed too. That's enough moving air to strain the open weave.
Ironing and storage
Low heat only, for both. Mulmul just needs a light press. It's not a fabric that needs heavy ironing, and a protective cloth over any trim (like the crochet cuffs on Roz) will keep that detailing intact. For georgette, keep the iron on its lowest steam setting and iron from the reverse side. A handheld steamer is honestly the safer option if you have one, since it smooths out wrinkles without direct contact on the sheer fabric. Store both on padded hangers rather than wire ones, and skip the plastic garment bags. A breathable cotton or muslin bag keeps the fabric from trapping moisture.
None of this is complicated. But skipping it is exactly how a fabric this good starts to feel like a cheaper one. Treat it the way it's described, and it'll hold up the same way it did on day one.